examples published where the re ##quisite cat ##ion is arrived at by a variety of rear ##rang ##ement ##s . one such example involves the silver cat ##aly ##zed cat ##ion ##ic ring opening of ally ##lic di ##ch ##lor ##o cy ##lo ##pro ##pan ##es . the silver salt facilitates loss of chloride via precipitation of ins ##ol ##ub ##le silver chloride . in the total synthesis of roc ##ag ##lam ##ide , ep ##ox ##ida ##tion of a vinyl al ##ko ##xy ##alle ##ny ##l stan ##nan ##e likewise generates a pen ##tad ##ien ##yl cat ##ion via ring opening of the resultant ep ##oxide . = = = interrupted cy ##cl ##ization = = = once the cy ##cl ##ization has occurred , an ox
examples published where the requisite cation is arrived at by a variety of rearrangements. one such example involves the silver catalyzed cationic ring opening of allylic dichloro cylopropanes. the silver salt facilitates loss of chloride via precipitation of insoluble silver chloride. in the total synthesis of rocaglamide, epoxidation of a vinyl alkoxyallenyl stannane likewise generates a pentadienyl cation via ring opening of the resultant epoxide. = = = interrupted cyclization = = = once the cyclization has occurred, an ox